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OB-Xf Manual

LFO

OB-Xf provides two LFOs (or Low Frequency Oscillators), which can be used to modulate various targets. Both LFOs can modulate the exact same targets, however the major difference between them is that LFO 1 is global for all voices (free-running), whereas LFO 2 is per voice (key-triggered and always starting from 0° phase).

Sync and 1 & 2 Buttons

Section titled “Sync and 1 & 2 Buttons”
  • Sync: This button enables synchronization of the LFO rate to the host tempo. When enabled, the rate knob will be quantized to musical note divisions (for example: 1/4, 1/8 triplet, 1/16 dotted).
  • 1 & 2: Switches the view between the two LFOs, allowing you to edit the parameters of either.

Rate

Section titled “Rate”

This knob sets the speed of the LFO, ranging from 0 to 250 Hz (or tempo-synced to various note divisions).

Shape Knobs

Section titled “Shape Knobs”

These knobs allow you to set up a blend of different waveforms at the LFO output:

  • Sine - Triangle: Set to the left to mix in sine wave, to the right for a triangle wave, and in the middle (DC) for no output from this blend.
  • Pulse - Sawtooth: Set to the left to mix in a pulse wave, to the right for a sawtooth wave, and in the middle (DC) for no output from this blend.
  • Pulse Width - Tension: This vertical slider sets the pulse width of the pulse waveform and the tension of the sawtooth waveform respectively.
  • Sample & Hold - Sample & Glide: Set to the left to mix in a sample & hold waveform, to the right for a sample & glide waveform, and in the middle (DC) for no output from this blend.

Destination Columns

Section titled “Destination Columns”

Two columns of destination buttons allow you to select two sets of modulation destinations and their amount.

Mod 1 and Mod 2

Section titled “Mod 1 and Mod 2”

These knobs set the amount of modulation applied to the selected destinations for each column.

Destination Buttons

Section titled “Destination Buttons”

Each button corresponds to a specific modulation destination. When a multi-state button is activated, the LFO will modulate that parameter according to the amount set by the corresponding Mod knob. Each button has a positive and negative polarity option, represented by their left and right LEDs, respectively (green and red for LFO 1, yellow and blue for LFO 2).

The available modulation destinations include:

  • Mod 1:
    • Osc 1: Modulates the pitch of oscillator 1.
    • Osc 2: Modulates the pitch of oscillator 2.
    • Filter: Modulates the cutoff frequency of the filter.
  • Mod 2:
    • PW 1: Modulates the pulse width of oscillator 1.
    • PW 2: Modulates the pulse width of oscillator 2.
    • Volume: Modulates the post-filter amplifier output level.